Revealing plasmonic Gap modes in particle-on-film systems using dark-field spectroscopy

Dangyuan Lei; Antonio I. Fernández-Domínguez; Yannick Sonnefraud; Kannatassen Appavoo; Richard F. Haglund; John B. Pendry; Stefan A. Maier

doi:10.1021/nn204190e

Revealing plasmonic Gap modes in particle-on-film systems using dark-field spectroscopy

Dangyuan Lei, Antonio I. Fernández-Domínguez, Yannick Sonnefraud, Kannatassen Appavoo, Richard F. Haglund, John B. Pendry, Stefan A. Maier

Research output: Journal article publication › Journal article › Academic research › peer-review

173 Citations (Scopus)

Abstract

Polarization-controlled excitation of plasmonic modes in nanometric Au particle-on-film gaps is investigated experimentally using single-particle dark-field spectroscopy. Two distinct geometries are explored: nanospheres on top of and inserted in a thin gold film. Numerical simulations reveal that the three resonances arising in the scattering spectra measured for particles on top of a film originate from highly confined gap modes at the interface. These modes feature different azimuthal characteristics, which are consistent with recent theoretical transformation optics studies. On the other hand, the scattering maxima of embedded particles are linked to dipolar modes having different orientations and damping rates. Finally, the radiation properties of the particle-film gap modes are studied through the mapping of the scattered power within different solid angle ranges.

Original language	English
Pages (from-to)	1380-1386
Number of pages	7
Journal	ACS Nano
Volume	6
Issue number	2
DOIs	https://doi.org/10.1021/nn204190e
Publication status	Published - 28 Feb 2012
Externally published	Yes

Keywords

directional radiation
metal nanoparticles
particle-film interactions
plasmonic gap modes
single-particle spectroscopy

ASJC Scopus subject areas

General Materials Science
General Engineering
General Physics and Astronomy

More information

10.1021/nn204190e

Cite this

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title = "Revealing plasmonic Gap modes in particle-on-film systems using dark-field spectroscopy",

abstract = "Polarization-controlled excitation of plasmonic modes in nanometric Au particle-on-film gaps is investigated experimentally using single-particle dark-field spectroscopy. Two distinct geometries are explored: nanospheres on top of and inserted in a thin gold film. Numerical simulations reveal that the three resonances arising in the scattering spectra measured for particles on top of a film originate from highly confined gap modes at the interface. These modes feature different azimuthal characteristics, which are consistent with recent theoretical transformation optics studies. On the other hand, the scattering maxima of embedded particles are linked to dipolar modes having different orientations and damping rates. Finally, the radiation properties of the particle-film gap modes are studied through the mapping of the scattered power within different solid angle ranges.",

keywords = "directional radiation, metal nanoparticles, particle-film interactions, plasmonic gap modes, single-particle spectroscopy",

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AU - Lei, Dangyuan

AU - Fernández-Domínguez, Antonio I.

AU - Sonnefraud, Yannick

AU - Appavoo, Kannatassen

AU - Haglund, Richard F.

AU - Pendry, John B.

AU - Maier, Stefan A.

PY - 2012/2/28

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N2 - Polarization-controlled excitation of plasmonic modes in nanometric Au particle-on-film gaps is investigated experimentally using single-particle dark-field spectroscopy. Two distinct geometries are explored: nanospheres on top of and inserted in a thin gold film. Numerical simulations reveal that the three resonances arising in the scattering spectra measured for particles on top of a film originate from highly confined gap modes at the interface. These modes feature different azimuthal characteristics, which are consistent with recent theoretical transformation optics studies. On the other hand, the scattering maxima of embedded particles are linked to dipolar modes having different orientations and damping rates. Finally, the radiation properties of the particle-film gap modes are studied through the mapping of the scattered power within different solid angle ranges.

AB - Polarization-controlled excitation of plasmonic modes in nanometric Au particle-on-film gaps is investigated experimentally using single-particle dark-field spectroscopy. Two distinct geometries are explored: nanospheres on top of and inserted in a thin gold film. Numerical simulations reveal that the three resonances arising in the scattering spectra measured for particles on top of a film originate from highly confined gap modes at the interface. These modes feature different azimuthal characteristics, which are consistent with recent theoretical transformation optics studies. On the other hand, the scattering maxima of embedded particles are linked to dipolar modes having different orientations and damping rates. Finally, the radiation properties of the particle-film gap modes are studied through the mapping of the scattered power within different solid angle ranges.

KW - directional radiation

KW - metal nanoparticles

KW - particle-film interactions

KW - plasmonic gap modes

KW - single-particle spectroscopy

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Revealing plasmonic Gap modes in particle-on-film systems using dark-field spectroscopy

Abstract

Keywords

ASJC Scopus subject areas

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